Step 1: Overview of Biosphere Reserves.
Biosphere Reserves are areas that are recognized by UNESCO for the conservation of biodiversity. India has 12 such reserves recognized by UNESCO.
Step 2: Analysis of options.
- (A) 12: India has 12 Biosphere Reserves recognized by UNESCO.
- (B) 18: This is incorrect.
- (C) 15: This is incorrect.
- (D) 20: This is also incorrect.
Step 3: Conclusion.
The correct number of UNESCO recognized Biosphere Reserves in India is 12, so the correct answer is (A) 12.